Actually there are two versions of the TerraTec Cinergy HT PCI hybrid (DVBT/Analog) TV-Receiver card. One is based on SAA713x (oldcard) and a newer Version (MK2) based on cx88. While the old card seems to work fine
http://www.linuxtv.org/wiki/index.php/TerraTec_Cinergy_HT_PCI,
the MK2 Version is troublesome.
For those of you who have this card and had no luck activating it, here's how i could get the cards analog mode working.

Kernelmodule options

As the card is based on Conexant's CX 23880 chipset, the to be used kernel module is cx88xx. So be sure your kernel has the needed module and its dependencies. I was successful with gentoo-sources-2.6.25 upwards, i haven't tried lower versions. Actually, i use gentoo-sources-2.6.27-r7.
If you take a look on the supported cards of cx88xx in /usr/src/linux/Documentation/video4linux/CARDLIST.cx88 you won't find the TerraTec Cinergy HT PCI MK2. Don't ask me why and how (cause its been a while since i did it ), card=59 and tuner=71 will work, so I did the following.

Firmware
To get the needed firmware, take a look into the provided script extract_xc3028.pl, which is located in /usr/src/linux/Documentation/video4linux/
In the beginning of the code, there is stated how to proceed to get the firmware, following these i did:

Thank you for your answer. I'm only doing DVB-T as in Spain analog is been shutdown, so I only testing TDT, where audio works by the way. Regardind the remote, I found in the sources that it's not implemented, but looking at this: http://www.acaciaclose.co.uk/16253/138855.html it looks like it may be added. I'm going to spend time on this and if I make it work I'll post the information.